1772-6.8.3, 19 - special programming techniques, 19ć1, Special programming techniques – Rockwell Automation 1772-LP3 PLC - 2/30 Programmable Controller Programming and Operations Manual User Manual
Page 306
Chapter
19
19Ć1
Special Programming Techniques
There are several programming techniques that offer versatile control of
the process of machine operation. They include:
One-Shot
The one-shot programming technique uses a scan counter to set a bit on for
one scan only. There are two types of one-shots that can be programmed.
Leading
Edge
Trailing
Edge
A leading edge one-shot is used to set a bit on for one scan when the input
condition has made a false-true transition. The transition represents the
leading edge of the input pulse. The programming for a leading edge
one-shot is shown in Figure 19.1.
Figure 19.1
Leading Edge OneĆShot
Input Pulse: Bit 112/04
OneĆshot Bit: Bit 203/00
|ą|
04
112
|ą|
00
Application Program...
203
( SCT )
203
PR 002
AC 000
ON
OFF
ON
OFF
One Scan
Leading Edge
19.0
General
19.1
One Shot
19.1.1
Leading Edge OneĆShot
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